ayg wrote:

Um, isn't this what parameter defaults are for? {{{1|}}} will return empty if 1
is undefined.

fernandoacorreia wrote:

You may be right. But I think it's odd that an extension should receive such a
string. It seems like the template parameter syntax should be resolved within
the template, not exposed.

It's no more odd than specifying that a function should receive an object reference
(eg &$parser) rather than a scalar value (eg $filename).

In both cases you have to make sure that you pass the correct kind of parameter
otherwise your code is not going to work.

The point here is that the wiki-text "{{{3}}}" is defined to be the value of anonymous
parameter #3 unless that parameter is blank in which case the default value
is "{{{3}}}". Changing that definition would breaking existing usage and is unlikely
to happen. Having your function validate its input would probably be your best bet.

fernandoacorreia wrote:

OK, thanks.